The Combined Risk Index is calculated by normalizing the values of the following columns:
Each column is normalized to a range between 0 and 1, where 0 represents the lowest risk and 1 represents the highest risk. The Combined Risk Index is the average of these normalized values.
Note that for the normalization:
In the Pacific context, these variables are crucial due to their direct impact on communities' vulnerability to natural disasters, accessibility, and overall resilience:
High risk sites are classified as follows:
The percentage of high-risk sites is calculated as the number of high-risk sites divided by the total number of sites.
| Province | Mean Rainfall in Driest Quarter (mm) | Median Rainfall in Driest Quarter (mm) | Std Dev Rainfall in Driest Quarter (mm) | Mean Height above Sea Level (m) | Median Height above Sea Level (m) | Std Dev Height above Sea Level (m) | Mean Height above Drainage Network (m) | Median Height above Drainage Network (m) | Std Dev Height above Drainage Network (m) | High Risk Sites (Rainfall) | High Risk Sites (Height above Sea Level) | High Risk Sites (Height above Drainage Network) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sanma | 390 | 400 | 81 | 95 | 28 | 159 | 25 | 11 | 37 | 199 (91.0%) | 47 (22.0%) | 97 (44.0%) |
| Penama | 366 | 362 | 27 | 110 | 39 | 126 | 50 | 24 | 56 | 94 (82.0%) | 10 (9.0%) | 24 (21.0%) |
| Malampa | 280 | 269 | 35 | 45 | 19 | 82 | 18 | 13 | 25 | 188 (90.0%) | 58 (28.0%) | 88 (42.0%) |
| Shefa | 341 | 339 | 28 | 41 | 21 | 48 | 23 | 13 | 26 | 179 (97.0%) | 46 (25.0%) | 70 (38.0%) |
| Tafea | 169 | 159 | 56 | 177 | 155 | 133 | 50 | 41 | 45 | 174 (99.0%) | 18 (10.0%) | 32 (18.0%) |
| Torba | 682 | 666 | 100 | 41 | 22 | 60 | 29 | 18 | 34 | 29 (44.0%) | 12 (18.0%) | 22 (33.0%) |
| None | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| National | 321 | 323 | 121 | 87 | 30 | 124 | 31 | 16 | 40 | 863 (89.0%) | 191 (20.0%) | 333 (34.0%) |